Update README.md

Week 5/README.md

@@ -405,4 +405,5 @@ Even when no force (and therefore no acceleration) is affecting the Player objec
 * When calculating the acceleration, we do force / mass. A division in C++ code takes more clock cycles than multiplication. How could we improve this calculation? 
 * Add more forces to the Particle such as drag or wind.
 * Add some debugging to your project so you can get a better understanding of how the Particle is updated.
+* Add keyboard controls for movement in the other axes.
 * Make it so there is one object that is affected by the keyboard and others that are affected by forces for your coursework.